<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
    <title>My WebSocket</title>
</head>

<body>
欢迎使用WebSocket<br/>
<input id="text" type="text" />
<button onclick="send()">Send</button>    
<button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>

<script type="text/javascript">
    var websocket = null;

    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
    	//实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接  
        websocket = new WebSocket("ws://localhost:80/websocket");
    }
    else{
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
        console.log("Socket 已打开");  
    }

    //获得消息事件  
    websocket.onmessage = function(msg){
    	//发现消息进入    开始处理前端触发逻辑
        setMessageInnerHTML(msg.data);
        console.log(msg.data);  
    }

    //关闭事件 
    websocket.onclose = function(){
        setMessageInnerHTML("Socket已关闭");
        console.log("Socket已关闭"); 
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function(){
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket(){
        websocket.close();
    }

    //发送消息
    function send(){
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>